Nobody was talking about GNU. Most don't care if the userspace utilties are gnu coreutils/libc or musl/busybox for example.

AOSP is free and open source software.

You can't run AOSP on any existing hardware. Except maybe Pinephone and Libem 5, and only in theory.

Also, you should read all the good arguments on HN why you shouldn't use Chromium even though it's technically FLOSS.